Method and apparatus for uplink interference avoidance in case of timing advance group reconfiguration

ABSTRACT

Embodiments of the present application provide a method and apparatus for uplink interference avoidance in case of timing advance group reconfiguration. Wherein, the method includes: reconfiguring a TAG belonging to a secondary serving cell by terminal; and terminating, by the terminal, transmission of a periodic channel sounding reference signal Type-0 SRS in the secondary serving cell, and/or terminating, by the terminal, uplink non-adaptive retransmission in the secondary serving cell, after the terminal completes the reconfiguration of the TAG of the secondary serving cell and if a current TAG is a new one. With the embodiments of the present application, a problem of mutual interference with other terminal resulted from transmission of an uplink signal by the terminal in the secondary serving cell according to a wrong TA value may be avoided.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a continuation of International Application No.PCT/CN2011/085125, filed on Dec. 31, 2011, now pending, the contents ofwhich are herein wholly incorporated by reference.

TECHNICAL FIELD

The present application relates to the field of communications, and inparticular to a method and apparatus for uplink interference avoidancein case of timing advance group reconfiguration.

BACKGROUND

In Rel-10 of a long-term evolution advanced (LTE-A) system, in order toprovide a higher transmission rate to terminal, a carrier aggregationtechnology is introduced and 5 deployment scenarios of the carrieraggregation technology are defined. However, in the Rel-10, for anuplink, intra-band carrier aggregation is only supported. And at thesame time, for scenarios 4 and 5, that is, scenarios where receivingstations of uplink signals of different carriers are different, anuplink carrier aggregation technology is not supported. In LTE-A Rel-11,the carrier aggregation technology is further enhanced, with one aspectof enhancement being that for an uplink, carrier aggregation indifferent bands is supported, and uplink carrier aggregation beingsupported in scenarios 4 and 5.

When timing advance of an uplink signal of a secondary serving cellconfigured for terminal is different from that of a timing advance group(TAG) where the secondary serving cell is present, the secondary servingcell needs to be reconfigured to a correct TAG. FIG. 1 is a schematicdiagram of needing to reconfigure a TAG. In this figure, an eNBconfigures terminal with a primary serving cell f1 and a secondaryserving cell f2, both of them belonging to the same band.

A first case: the terminal is located at A point at a moment T1, whenreceiving stations of the secondary serving cell (Scell) and the primaryserving cell (Pcell) are identical, which are eNBs; hence, they belongto the same TAG, which is defined as a pTAG (i.e. a TAG where a Pcell ispresent). At a moment T2, the terminal moves to a coverage (such aspoint B) of a repeater, when a receiving station of uplink signals inthe Scell is changed into the repeater, which is different from areceiving station of the Pcell. Hence, the Scell is no longer suitableto belonging to the same TAG as that of the Pcell, and needs to bereconfigured to a new TAG, which is defined as a sTAG (i.e. a TAG wherethere exists a Scell only).

A second case: contrary to the first case, the terminal moves from thecoverage of the repeater to the coverage of the eNB. In such a case, theScell of the terminal needs to be reconfigured from the sTAG to thepTAG.

For the above second case, after the Scell is reconfigured to the pTAG,as a timing advance (TA) value of the pTAG is known, after thereconfiguration process is completed, the terminal may transmit anuplink signal in the Scell immediately. While for the first case, afterthe Scell is reconfigured to a new sTAG, as an uplink TA value of thenew sTAG is unknown, after the reconfiguration process is completed, theterminal needs to execute a random access process in the Scell to obtainan initial TA value of the sTAG. However, in the process of obtainingthe TA value of the sTAG by the terminal, if the terminal transmits anuplink signal in the Scell according to the TA value of the pTAG, as theTA value cannot ensure that the time when the uplink signal of theterminal reaches the repeater and those of other terminals aresynchronous, it possibly results in mutual interference with otherterminals.

It should be noted that the above description of the background art ismerely provided for clear and complete explanation of the presentapplication and for easy understanding by those skilled in the art. Andit should not be understood that the above technical solution is knownto those skilled in the art as it is described in the background art ofthe present application.

SUMMARY

Embodiments of the present application provide a method and apparatusfor uplink interference avoidance in case of timing advance groupreconfiguration, so as to solve a problem of interference in therelevant art resulted from that the time when an uplink signal of aterminal reaches an uplink access point and those of other terminals arenot synchronous when the terminal performs uplink communication by usingan old TA value with a new uplink access point after being TAGreconfigured.

An embodiment of the present application provides a method for uplinkinterference avoidance in case of timing advance group reconfiguration,including:

reconfiguring, by terminal, a timing advance group belonging to asecondary serving cell; and

terminating, by the terminal, transmission of a periodic channelsounding reference signal in the secondary serving cell, and/orterminating, by the terminal, uplink non-adaptive retransmission in thesecondary serving cell, after the terminal completes reconfiguration ofthe timing advance group of the secondary serving cell and if a currenttiming advance group is a new one.

An embodiment of the present application provides a method for uplinkinterference avoidance in case of timing advance group reconfiguration,including:

reconfiguring, by terminal, a timing advance group belonging to asecondary serving cell; and

releasing, by the terminal, configuration of a periodic channel soundingreference signal of the secondary serving cell, and/or terminating, bythe terminal, uplink non-adaptive retransmission in the secondaryserving cell, after the terminal completes reconfiguration of the timingadvance group of the secondary serving cell and if a current timingadvance group is a new one.

An embodiment of the present application provides a method for uplinkinterference avoidance in case of timing advance group reconfiguration,including:

reconfiguring, by terminal, a timing advance group belonging to asecondary serving cell; and

terminating, by the terminal, transmission of a periodic channelsounding reference signal in the secondary serving cell, and/or flushingall buffers of uplink hybrid automatic retransmission requests to whichthe secondary serving cell corresponds, after the terminal completesreconfiguration of the timing advance group of the secondary servingcell and if a current timing advance group is a new one.

An embodiment of the present application provides a method for uplinkinterference avoidance in case of timing advance group reconfiguration,including:

reconfiguring, by terminal, a timing advance group belonging to asecondary serving cell; and

releasing, by the terminal, configuration of a periodic channel soundingreference signal of the secondary serving cell, and/or flushing allbuffers of uplink hybrid automatic retransmission requests to which thesecondary serving cell corresponds, after the terminal completesreconfiguration of the timing advance group of the secondary servingcell and if a current timing advance group is a new one.

An embodiment of the present application provides an apparatus foruplink interference avoidance in case of timing advance groupreconfiguration, including:

a timing advance group reconfiguring unit, configured to reconfigure atiming advance group belonging to a secondary serving cell;

a judging unit, configured to judge whether the reconfigured timingadvance group is a new one, and if yes, notifying an executing unit; and

the executing unit, configured to terminate transmission of a periodicchannel sounding reference signal in the secondary serving cellperformed by terminal, and/or terminate uplink non-adaptiveretransmission in the secondary serving cell performed by the terminal,according to a notification transmitted by the judging unit.

An embodiment of the present application provides an apparatus foruplink interference avoidance in case of timing advance groupreconfiguration, including:

a timing advance group reconfiguring unit, configured to reconfigure atiming advance group belonging to a secondary serving cell;

a judging unit, configured to judge whether the reconfigured timingadvance group is a new one, and if yes, notifying an executing unit; and

the executing unit, configured to release configuration of a periodicchannel sounding reference signal of the terminal in the secondaryserving cell, and/or terminate uplink non-adaptive retransmission in thesecondary serving cell performed by the terminal, according to anotification transmitted by the judging unit.

An embodiment of the present application provides an apparatus foruplink interference avoidance in case of timing advance groupreconfiguration, including:

a timing advance group reconfiguring unit, configured to reconfigure atiming advance group belonging to a secondary serving cell;

a judging unit, configured to judge whether the reconfigured timingadvance group is a new one, and if yes, notifying an executing unit; and

the executing unit, configured to terminate transmission of a periodicchannel sounding reference signal in the secondary serving cellperformed by the terminal, and/or flush all buffers of uplink hybridautomatic retransmission requests to which the secondary serving cell ofthe terminal corresponds, according to a notification transmitted by thejudging unit.

An embodiment of the present application provides an apparatus foruplink interference avoidance in case of timing advance groupreconfiguration, including:

a timing advance group reconfiguring unit, configured to reconfigure atiming advance group belonging to a secondary serving cell;

a judging unit, configured to judge whether the reconfigured timingadvance group is a new one, and if yes, notifying an executing unit; and

the executing unit, configured to release configuration of a periodicchannel sounding reference signal of the terminal in the secondaryserving cell, and/or flush all buffers of uplink hybrid automaticretransmission requests to which the secondary serving cell of theterminal corresponds, according to a notification transmitted by thejudging unit.

The advantage of the embodiments of the present application resides inthat interference of a terminal to other terminals due to that theterminal performs communication with an access point in a new TAG byusing an old TA value, after it performs TAG reconfiguration but has notupdated the TA value.

With reference to the following description and drawings, the particularembodiments of the present application are disclosed in detail, and theprinciple of the present application and the manners of use areindicated. It should be understood that the scope of the embodiments ofthe present application is not limited thereto. The embodiments of thepresent application contain many alternations, modifications andequivalents within the spirits and scope of the terms of the appendedclaims.

Features that are described and/or illustrated with respect to oneembodiment may be used in the same way or in a similar way in one ormore other embodiments and/or in combination with or instead of thefeatures of the other embodiments.

It should be emphasized that the term “includes/including” when used inthis specification is taken to specify the presence of stated features,integers, steps or components but does not preclude the presence oraddition of one or more other features, integers, steps, components orgroups thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings are included to provide further understanding of thepresent application, which constitute a part of this application, andare not intended to limit the present application. In the drawings:

FIG. 1 is a schematic diagram of needing to reconfigure a TAG;

FIG. 2 is a flowchart of a terminal being reconfigured from a pTAG to anew sTAG and obtaining a TA value of an embodiment of the presentapplication;

FIG. 3 is a flowchart of a method for uplink interference avoidance incase of timing advance group reconfiguration of an embodiment of thepresent application;

FIG. 4 is a particular flowchart of a method for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application;

FIG. 5 is a flowchart of a method for uplink interference avoidance incase of timing advance group reconfiguration of an embodiment of thepresent application;

FIG. 6 is a particular flowchart of a method for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application;

FIG. 7 is a flowchart of a method for uplink interference avoidance incase of timing advance group reconfiguration of an embodiment of thepresent application;

FIG. 8 is a particular flowchart of a method for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application;

FIG. 9 is a flowchart of a method for uplink interference avoidance incase of timing advance group reconfiguration of an embodiment of thepresent application;

FIG. 10 is a particular flowchart of a method for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application;

FIG. 11 is a structural diagram of an apparatus for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application;

FIG. 12 is a structural diagram of an apparatus for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application;

FIG. 13 is a structural diagram of an apparatus for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application; and

FIG. 14 is a structural diagram of an apparatus for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

DETAILED DESCRIPTION

For the object, technical solution and advantage of the presentapplication to be more clear, particular embodiments of the presentapplication shall be described below in detail. The illustrativeembodiments of the present application and their description are forexplanation of the present application, and not intended to limit thepresent application.

Embodiment 1

FIG. 2 is a flowchart of a terminal being reconfigured from a pTAG to anew sTAG and obtaining a TA value of an embodiment of the presentapplication.

This embodiment is applicable to the second case in FIG. 1, and is alsoapplicable to scenarios 2 and 3 of carrier aggregation. In scenarios 2and 3, when a plurality of serving cells configured for the terminal arecarriers in different bands, in case of a 2%-3% probability, uplinktiming advance of these serving cells will be different, and a processof a pTAG being reconfigured to a new sTAG and a TA value being obtainedneeds to be performed.

Step 201: judging, by terminal, whether a secondary serving cell needsTAG reconfiguration. An eNB transmits a radio resource reconfigurationsignaling to the terminal, and the terminal performs the TAGreconfiguration of the secondary serving cell, that is, reconfiguringthe secondary serving cell from a pTAG to a sTAG, the time of completionof the reconfiguration being taken as T1;

step 202: feeding back, by the terminal to the eNB, a reconfigurationcompletion message;

step 203: transmitting, by the eNB to the terminal, PDCCH order totrigger the terminal to initiate a random access process in thesecondary serving cell;

step 204: transmitting, by the terminal, a preamble in the secondaryserving cell; and

step 205: feeding back, by the eNB to the terminal, a response (RAR) tothe secondary serving cell, the response including a TA value, and thetime of receiving a TA value of a new TAG by the terminal being taken asT2.

In addition to the TA value obtained in steps 203-205, a TA value mayalso be obtained from a TA command medium access control protocol layercontrol element (TA command MAC CE).

Embodiment 2

FIG. 3 is a flowchart of a method for uplink interference avoidance incase of timing advance group reconfiguration of an embodiment of thepresent application.

Step 301: reconfiguring, by terminal, a TAG belonging to a secondaryserving cell; and

Step 302: terminating, by the terminal, transmission of a periodicchannel sounding reference signal (type-0 SRS) in the secondary servingcell, and/or terminating, by the terminal, uplink non-adaptiveretransmission in the secondary serving cell, after the terminalcompletes reconfiguration of the TAG of the secondary serving cell andif a current TAG is a new one.

Step 302 further includes: canceling, by the terminal, transmission ofan aperiodic channel sounding reference signal (type-1 SRS) in thesecondary serving cell, if there is a pending aperiodic channel soundingreference signal in the secondary serving cell.

After step 302, the method further includes: restarting the transmissionof the type-0 SRS in the secondary serving cell by the terminal, and/orrestarting the uplink non-adaptive retransmission in the secondaryserving cell by the terminal, after receiving a TA value of the new TAG.

With the embodiment of the present application, interference of theterminal to other terminals due to that the terminal performscommunication with an access point in a new TAG by using an old TAvalue, after it performs TAG reconfiguration but has not updated the TAvalue, especially interference of the terminal to other terminals due tothat the terminal transmits an uplink signal in the secondary servingcell according to a wrong TA value.

Embodiment 3

FIG. 4 is a particular flowchart of a method for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

Step 401: for a secondary serving cell, informing, by a radio resourcecontrol protocol layer (an RRC layer) of terminal, a medium accesscontrol protocol layer (an MAC layer) of a TAG index of a TAG belongingto the secondary serving cell and a timing advance timer (TAT) used bythe TAG, after completing TAG reconfiguration of the secondary servingcell;

step 402: judging, by the MAC layer of the terminal, whether thesecondary serving cell is reconfigured with a new TAG after the MAClayer receives a notification of TAG reconfiguration of the secondaryserving cell from the RRC layer; it is possible that one or more TAGsare maintained in the terminal, and if a currently reconfigured TAG isthe same as a TAG that is maintained by the terminal, it shows that thecurrently reconfigured TAG is not a new one, and it enters into step405; otherwise, it shows that the currently reconfigured TAG is a newone, and it enters into step 403; wherein, if the terminal maintainsother TAGs, a corresponding TA value is known, and the terminal may usethe TA value for uplink communication, without interference to the otherterminals;

step 403: terminating transmission of a type-0 SRS in the secondaryserving cell by the terminal, canceling transmission of a type-1 SRS inthe secondary serving cell by the terminal, and terminating uplinknon-adaptive retransmission in the secondary serving cell by theterminal; one or more of the above three method of processing may beemployed by the terminal, which is determined according to a type ofuplink communication of the terminal in the secondary serving cell;

wherein, either one of the following manners may be employed by theterminal in terminating uplink non-adaptive retransmission in thesecondary serving cell: first, the terminal maintains all feedback flagsfor uplink hybrid automatic retransmission requests (possibly includingflags for transmission success and flags for transmission failure)unchanged, and terminates the uplink non-adaptive retransmission in thesecondary serving cell; second, setting feedback flags for uplink hybridautomatic retransmission requests by the terminal as flags fortransmission success, thereby making the uplink non-adaptiveretransmission in the secondary serving cell terminated;

step 404: restarting the retransmission of the type-0 SRS in thesecondary serving cell by the terminal, and/or restarting the uplinknon-adaptive retransmission in the secondary serving cell by theterminal (for the above first manner), after receiving a TA value of thenewly configured TAG, for example, receiving the TA value in the mannerof the embodiment shown in FIG. 2, the above two types of transmissionbeing determined in dependence on a demand of uplink communication ofthe terminal possibly exists in the secondary serving cell; and

step 405: performing, by the terminal, normally uplink communication inthe secondary serving cell by using the known TA value.

Embodiment 4

FIG. 5 is a flowchart of a method for uplink interference avoidance incase of timing advance group reconfiguration of an embodiment of thepresent application.

Step 501: reconfiguring, by terminal, a TAG belonging to a secondaryserving cell; and

Step 502: releasing, by the terminal, configuration of a type-0 SRS ofthe secondary serving cell, and/or terminating, by the terminal, uplinknon-adaptive retransmission in the secondary serving cell, after theterminal completes TAG reconfiguration of the secondary serving cell andif a current timing advance group is a new one, the releasedconfiguration of the type-0 SRS of the terminal making the terminalunable to perform type-0 SRS uplink communication.

Step 502 further includes: canceling, by the terminal, transmission of atype-1 SRS in the secondary serving cell, if there is a pendingaperiodic channel sounding reference signal in the secondary servingcell.

After step 502, the method further includes: restarting theretransmission of the uplink non-adaptive retransmission in thesecondary serving cell by the terminal, after receiving a TA value ofthe new TAG, for example, at the time point T2 in FIG. 2.

With the embodiment of the present application, interference of theterminal to other terminals due to that the terminal performscommunication with an access point in a new TAG by using an old TAvalue, after it performs TAG reconfiguration but has not updated the TAvalue, especially interference of the terminal to other terminals due tothat the terminal transmits an uplink signal in the secondary servingcell according to a wrong TA value.

Embodiment 5

FIG. 6 is a particular flowchart of a method for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

Step 601: for a secondary serving cell, informing, by a radio resourcecontrol protocol layer (an RRC layer) of terminal, a medium accesscontrol protocol layer (an MAC layer) of the terminal, of a TAG index ofa TAG belonging to the secondary serving cell and a timing advance timer(TAT) used by the TAG, after completing TAG reconfiguration of thesecondary serving cell;

step 602: judging, by the RRC layer of the terminal, whether thesecondary serving cell is reconfigured with a new TAG; it is possiblethat one or more TAGs are maintained in the terminal, and if a currentlyreconfigured TAG is the same as a TAG that is maintained by theterminal, it shows that the currently reconfigured TAG is not a new one,and it enters into step 607; otherwise, it shows that the currentlyreconfigured TAG is a new one, and it enters into step 603;

step 603: releasing, by the terminal, configuration of a type-0 SRS;

step 604: judging, by the MAC layer of the terminal, whether thesecondary serving cell is reconfigured with a new TAG after the MAClayer receives a notification of TAG reconfiguration of the secondaryserving cell from the RRC layer; it is possible that one or more TAGsare maintained in the terminal, and if a currently reconfigured TAG isthe same as a TAG that is maintained by the terminal, it shows that thecurrently reconfigured TAG is not a new one, and it enters into step607; otherwise, it shows that the currently reconfigured TAG is a newone, and it enters into step 605; wherein, if the terminal maintainsother TAGs, a corresponding TA value is known, and the terminal may usethe TA value for uplink communication, without interference to the otherterminals;

step 605: canceling transmission of a type-1 SRS in the secondaryserving cell by the terminal, and terminating transmission of uplinknon-adaptive retransmission in the secondary serving cell by theterminal;

one or more of steps 603, 605 may be employed by the terminal, which isdetermined by a type of uplink communication of the terminal in thesecondary serving cell;

wherein, either one of the following manners may be employed by theterminal in terminating uplink non-adaptive retransmission in thesecondary serving cell: first, the terminal maintains all feedback flagsfor uplink hybrid automatic retransmission requests (possibly includingflags for transmission success and flags for transmission failure)unchanged, and terminates the uplink non-adaptive retransmission in thesecondary serving cell; second, setting feedback flags for uplink hybridautomatic retransmission requests by the terminal as flags fortransmission success, thereby making the uplink non-adaptiveretransmission in the secondary serving cell terminated;

step 606: restarting the uplink non-adaptive retransmission in thesecondary serving cell by the terminal (for the above first manner),after receiving a TA value of the current TAG, for example, receivingthe TA value in the manner of the embodiment shown in FIG. 2; and

step 607: performing, by the terminal, normally uplink communication inthe secondary serving cell by using the known TA value.

Embodiment 6

FIG. 7 is a flowchart of a method for uplink interference avoidance incase of timing advance group reconfiguration of an embodiment of thepresent application.

Step 701: reconfiguring, by terminal, a TAG belonging to a secondaryserving cell; and

Step 702: terminating, by the terminal, transmission of a type-0 SRS inthe secondary serving cell, and/or flushing all buffers of uplink hybridautomatic retransmission requests (HARQ buffers) to which the secondaryserving cell corresponds, after the terminal completes reconfigurationof the TAG of the secondary serving cell and if a current TAG is a newone; wherein flushing the HARQ buffers of the terminal in the secondaryserving cell may make the terminal unable to perform uplink non-adaptiveretransmission.

Step 702 further includes: canceling, by the terminal, transmission of atype-1 SRS in the secondary serving cell, if there is a pendingaperiodic channel sounding reference signal in the secondary servingcell.

After step 702, the method further includes: restarting the transmissionof the type-0 SRS in the secondary serving cell by the terminal, afterreceiving a TA value of the new TAG, for example, at the time point T2in FIG. 2.

With the embodiment of the present application, interference of theterminal to other terminals due to that the terminal performscommunication with an access point in a new TAG by using an old TAvalue, after it performs TAG reconfiguration but has not updated the TAvalue, especially interference of the terminal to other terminals due tothat the terminal transmits an uplink signal in the secondary servingcell according to a wrong TA value.

Embodiment 7

FIG. 8 is a particular flowchart of a method for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

Step 801: for a secondary serving cell, informing, by a radio resourcecontrol protocol layer (an RRC layer) of terminal, a medium accesscontrol protocol layer (an MAC layer) of the terminal, of a TAG index ofa TAG belonging to the secondary serving cell and a timing advance timer(TAT) used by the TAG, after completing TAG reconfiguration of thesecondary serving cell;

Step 802: judging, by the MAC layer of the terminal, whether thesecondary serving cell is reconfigured with a new TAG after the MAClayer receives a notification of TAG reconfiguration of the secondaryserving cell from the RRC layer; it is possible that one or more TAGsare maintained in the terminal, and if a currently reconfigured TAG isthe same as a TAG that is maintained by the terminal, it shows that thecurrently reconfigured TAG is not a new one, and it enters into step805; otherwise, it shows that the currently reconfigured TAG is a newone, and it enters into step 803; wherein, if the terminal maintainsother TAGs, a corresponding TA value is known, and the terminal may usethe TA value for uplink communication, without interference to the otherterminals;

step 803: terminating transmission of a type-0 SRS in the secondaryserving cell by the terminal, canceling transmission of a type-1 SRS inthe secondary serving cell by the terminal, and flushing all uplink HARQbuffers to which the secondary serving cell corresponds; one or more ofthe above three method of processing may be employed by the terminal,which is determined according to a type of uplink communication of theterminal in the secondary serving cell;

step 804: restarting the transmission of the type-0 SRS in the secondaryserving cell by the terminal after receiving a TA value of the currentTAG, for example, receiving the TA value in the manner of the embodimentshown in FIG. 2, the above restarted retransmission being determined independence on a demand of uplink communication of the terminal possiblyexists in the secondary serving cell; and

step 805: performing, by the terminal, normally uplink communication inthe secondary serving cell by using the known TA value.

Embodiment 8

FIG. 9 is a flowchart of a method for uplink interference avoidance incase of timing advance group reconfiguration of an embodiment of thepresent application.

Step 901: reconfiguring, by terminal, a TAG belonging to a secondaryserving cell; and

Step 902: releasing, by the terminal, configuration of a type-0 SRS,and/or flushing all uplink HARQ buffers to which the secondary servingcell corresponds, after the terminal completes the TAG reconfigurationof the secondary serving cell and if a current TAG is a new one; whereinflushing all the uplink HARQ buffers to which the secondary serving cellcorresponds may make the terminal unable to perform uplink non-adaptiveretransmission, and releasing configuration of a type-0 SRS by theterminal may make the terminal unable to perform type-0 SRS uplinkcommunication.

Step 902 further includes: canceling, by the terminal, transmission of atype-1 SRS in the secondary serving cell, if there is a pendingaperiodic channel sounding reference signal in the secondary servingcell.

With the embodiment of the present application, interference of theterminal to other terminals due to that the terminal performscommunication with an access point in a new TAG by using an old TAvalue, after it performs TAG reconfiguration but has not updated the TAvalue, especially interference of the terminal to other terminals due tothat the terminal transmits an uplink signal in the secondary servingcell according to a wrong TA value.

Embodiment 9

FIG. 10 is a particular flowchart of a method for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

Step 1001: for a secondary serving cell, informing, by a radio resourcecontrol protocol layer (an RRC layer) of terminal, a medium accesscontrol protocol layer (an MAC layer) of the terminal, of a TAG index ofa TAG belonging to the secondary serving cell and a timing advance timer(TAT) used by the TAG, after completing TAG reconfiguration of thesecondary serving cell;

step 1002: judging, by the RRC layer of the terminal, whether thesecondary serving cell is reconfigured with a new TAG; it is possiblethat one or more TAGs are maintained in the terminal, and if a currentlyreconfigured TAG is the same as a TAG that is maintained by theterminal, it shows that the currently reconfigured TAG is not a new one,and it enters into step 1006; otherwise, it shows that the currentlyreconfigured TAG is a new one, and it enters into step 1003;

step 1003: releasing, by the terminal, configuration of a type-0 SRS ofthe secondary serving cell;

step 1004: judging, by the MAC layer of the terminal, whether thesecondary serving cell is reconfigured with a new TAG after the MAClayer receives a notification of TAG reconfiguration of the secondaryserving cell from the RRC layer; it is possible that one or more TAGsare maintained in the terminal, and if a currently reconfigured TAG isthe same as a TAG that is maintained by the terminal, it enters intostep 1006; otherwise, it enters into step 1005; wherein, if the terminalmaintains other TAGs, a corresponding TA value is known, and theterminal may use the TA value for uplink communication, withoutinterference to the other terminals;

step 1005: canceling transmission of a type-1 SRS in the secondaryserving cell by the terminal, and flushing all uplink HARQ buffers towhich the secondary serving cell corresponds;

one or more of steps 1003, 1005 may be employed by the terminal, whichis determined by a type of uplink communication of the terminal in thesecondary serving cell;

step 1006: performing, by the terminal, normally uplink communication inthe secondary serving cell by using the known TA value.

Embodiment 10

FIG. 11 is a structural diagram of an apparatus for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

The apparatus includes a TAG reconfiguring unit 1101, a judging unit1102 and an executing unit 1103.

The TAG reconfiguring unit 1101 is configured to reconfigure a TAGbelonging to a secondary serving cell.

The judging unit 1102 is configured to judge whether the reconfiguredTAG is a new one, and if yes, notifying the executing unit 1103.

The executing unit 1103 is configured to terminate transmission of atype-0 SRS in the secondary serving cell performed by terminal, and/orterminate uplink non-adaptive retransmission in the secondary servingcell performed by the terminal, according to a notification transmittedby the judging unit 1102.

The executing unit 1103 is further configured to cancel transmission ofa type-1 SRS in the secondary serving cell performed by the terminal,according to a notification transmitted by the judging unit 1102.

The apparatus further includes a notifying unit 1104 configured tonotify the executing unit 1103 after the terminal receives a TA value ofthe new TAG, for example, at the time point T2 in FIG. 2. At thismoment, the executing unit 1103 may restart the transmission of thetype-0 SRS in the secondary serving cell performed by the terminal,and/or restart the uplink non-adaptive retransmission in the secondaryserving cell performed by the terminal.

With the embodiment of the apparatus of the present application,interference of the terminal to other terminals due to that the terminalperforms communication with an access point in a new TAG by using an oldTA value, after it performs TAG reconfiguration but has not updated theTA value, especially interference of the terminal to other terminals dueto that the terminal transmits an uplink signal in the secondary servingcell according to a wrong TA value.

Embodiment 11

FIG. 12 is a structural diagram of an apparatus for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

The apparatus includes a TAG reconfiguring unit 1201, a judging unit1202 and an executing unit 1203.

The TAG reconfiguring unit 1201 is configured to reconfigure a TAGbelonging to a secondary serving cell

The judging unit 1202 is configured to judge whether the reconfiguredTAG is a new one, and if yes, notifying the executing unit 1202.

The executing unit 1203 is configured to release configuration of atype-0 SRS of the terminal in the secondary serving cell, and/orterminate uplink non-adaptive retransmission in the secondary servingcell performed by the terminal, according to a notification transmittedby the judging unit 1202.

The executing unit 1302 is further configured to cancel transmission ofa type-1 SRS in the secondary serving cell performed by the terminal,according to a notification transmitted by the judging unit 1202.

When the executing unit maintains all feedback flags of uplink hybridautomatic retransmission requests unchanged, and terminates uplinknon-adaptive retransmission in the secondary serving cell performed bythe terminal, the apparatus further includes a notifying unit 1204configured to, after the terminal receives a TA value of the new TAG,for example, at the time point T2 in FIG. 2, notify the executing unit1203. At this moment, the executing unit 1203 may restart the uplinknon-adaptive retransmission in the secondary serving cell.

With the embodiment of the apparatus of the present application,interference of the terminal to other terminals due to that the terminalperforms communication with an access point in a new TAG by using an oldTA value, after it performs TAG reconfiguration but has not updated theTA value, especially interference of the terminal to other terminals dueto that the terminal transmits an uplink signal in the secondary servingcell according to a wrong TA value.

Embodiment 12

FIG. 13 is a structural diagram of an apparatus for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

The apparatus includes a TAG reconfiguring unit 1301, a judging unit1302 and an executing unit 1303.

The TAG reconfiguring unit 1301 is configured to reconfigure a TAGbelonging to a secondary serving cell.

The judging unit 1302 is configured to judge whether the reconfiguredTAG is a new one, and if yes, notifying the executing unit 1303.

The executing unit 1303 is configured to terminate transmission of atype-0 SRS in the secondary serving cell performed by the terminal,and/or flush all uplink HARQ buffers to which the secondary serving cellof the terminal corresponds, according to a notification transmitted bythe judging unit 1302.

The executing unit 1303 is further configured to cancel transmission ofa type-1 SRS in the secondary serving cell performed by the terminal,according to a notification transmitted by the judging unit 1302.

The apparatus further includes a notifying unit 1304 configured to,after the terminal receives a TA value of the new TAG, for example, atthe time point T2 in FIG. 2, notify the executing unit 1303. At thismoment, the executing unit 1303 may restart the transmission of thetype-0 SRS in the secondary serving cell.

With the embodiment of the apparatus of the present application,interference of the terminal to other terminals due to that the terminalperforms communication with an access point in a new TAG by using an oldTA value, after it performs TAG reconfiguration but has not updated theTA value, especially interference of the terminal to other terminals dueto that the terminal transmits an uplink signal in the secondary servingcell according to a wrong TA value.

Embodiment 13

FIG. 14 is a structural diagram of an apparatus for uplink interferenceavoidance in case of timing advance group reconfiguration of anembodiment of the present application.

The apparatus includes a TAG reconfiguring unit 1401, a judging unit1402 and an executing unit 1403.

The TAG reconfiguring unit 1401 is configured to reconfigure a TAGbelonging to a secondary serving cell;

The judging unit 1402 is configured to judge whether the reconfiguredTAG is a new one, and if yes, notifying the executing unit 1403.

The executing unit 1403 is configured to release configuration of atype-0 SRS of the terminal in the secondary serving cell, and/or flushall uplink HARQ buffers to which the secondary serving cell of theterminal corresponds, according to a notification transmitted by thejudging unit 1302.

The executing unit 1403 is further configured to cancel transmission ofa type-1 SRS in the secondary serving cell performed by the terminal,according to a notification transmitted by the judging unit 1402.

With the embodiment of the apparatus of the present application,interference of the terminal to other terminals due to that the terminalperforms communication with an access point in a new TAG by using an oldTA value, after it performs TAG reconfiguration but has not updated theTA value, especially interference of the terminal to other terminals dueto that the terminal transmits an uplink signal in the secondary servingcell according to a wrong TA value.

The above apparatuses and methods of the present application may beimplemented by hardware, or by hardware in combination with software.The present application relates to such a computer-readable program thatwhen the program is executed by a logic device, the logic device isenabled to carry out the apparatus or components as described above, orto carry out the methods or steps as described above. The presentapplication also relates to a storage medium for storing the aboveprogram, such as a hard disk, a floppy disk, a CD, a DVD, and a flashmemory, etc.

The present application is described above with reference to particularembodiments. However, it should be understood by those skilled in theart that such a description is illustrative only, and not intended tolimit the protection scope of the present application. Various variantsand modifications may be made by those skilled in the art according tothe spirits and principle of the present application, and such variantsand modifications fall within the scope of the present application.

What is claimed is:
 1. An apparatus for uplink interference avoidance incase of timing advance group reconfiguration, comprising: a timingadvance group reconfiguring unit, configured to reconfigure a timingadvance group belonging to a secondary serving cell; a judging unit,configured to judge whether the reconfigured timing advance group is anew one, and if yes, notifying an executing unit; and the executingunit, configured to terminate transmission of a periodic channelsounding reference signal in the secondary serving cell performed byterminal, and/or terminate uplink non-adaptive retransmission in thesecondary serving cell performed by the terminal, according to anotification transmitted by the judging unit.
 2. The apparatus accordingclaim 1, wherein the executing unit is further configured to canceltransmission of an aperiodic channel sounding reference signal in thesecondary serving cell performed by the terminal, according to anotification transmitted by the judging unit.
 3. The apparatus accordingclaim 1, wherein the apparatus further comprises: a notifying unit,configured to notify the executing unit to restart the transmission ofthe periodic channel sounding reference signal in the secondary servingcell performed by the terminal, and/or restart the uplink non-adaptiveretransmission in the secondary serving cell performed by the terminal,after the terminal receives a timing advance value of the new timingadvance group.
 4. The apparatus according to claim 1, wherein theexecuting unit is further configured to maintain all feedback flags foruplink hybrid automatic retransmission requests unchanged and terminatethe uplink non-adaptive retransmission in the secondary serving cellafter the terminal completes the reconfiguration of the timing advancegroup of the secondary serving cell and if the current timing advancegroup is a new one.
 5. The apparatus according to claim 1, wherein theexecuting unit is further configured to set all feedback flags foruplink hybrid automatic retransmission requests as transmission successafter the terminal completes the reconfiguration of the timing advancegroup of the secondary serving cell and if the current timing advancegroup is a new one.
 6. An apparatus for uplink interference avoidance incase of timing advance group reconfiguration, comprising: a timingadvance group reconfiguring unit, configured to reconfigure a timingadvance group belonging to a secondary serving cell; a judging unit,configured to judge whether the reconfigured timing advance group is anew one, and if yes, notifying an executing unit; and the executingunit, configured to release configuration of a periodic channel soundingreference signal of the terminal in the secondary serving cell, and/orterminate uplink non-adaptive retransmission in the secondary servingcell performed by the terminal, according to a notification transmittedby the judging unit.
 7. The apparatus according claim 6, wherein theexecuting unit is further configured to cancel transmission of anaperiodic channel sounding reference signal in the secondary servingcell performed by the terminal, according to a notification transmittedby the judging unit.
 8. The apparatus according claim 6, wherein if theexecuting unit maintains all feedback flags of uplink hybrid automaticretransmission requests unchanged, and terminates uplink non-adaptiveretransmission in the secondary serving cell performed by the terminal,the apparatus further comprises: a notifying unit, configured to notifythe executing unit to restart the uplink non-adaptive retransmission inthe secondary serving cell, after the terminal receives a timing advancevalue of the new timing advance group.
 9. The apparatus according toclaim 6, wherein the executing unit is further configured to set allfeedback flags for the uplink hybrid automatic retransmission requestsas transmission success after the terminal completes the reconfigurationof the timing advance group of the secondary serving cell and if thecurrent timing advance group is a new one.
 10. An apparatus for uplinkinterference avoidance in case of timing advance group reconfiguration,comprising: a timing advance group reconfiguring unit, configured toreconfigure a timing advance group belonging to a secondary servingcell; a judging unit, configured to judge whether the reconfiguredtiming advance group is a new one, and if yes, notifying an executingunit; and the executing unit, configured to terminate transmission of aperiodic channel sounding reference signal in the secondary serving cellperformed by the terminal, and/or flush all buffers of uplink hybridautomatic retransmission requests to which the secondary serving cell ofthe terminal corresponds, according to a notification transmitted by thejudging unit.
 11. The apparatus according claim 10, wherein theexecuting unit is further configured to cancel transmission of anaperiodic channel sounding reference signal in the secondary servingcell performed by the terminal, according to a notification transmittedby the judging unit.
 12. The apparatus according claim 10, wherein theapparatus further comprises: a notifying unit, configured to notify theexecuting unit to restart the periodic channel sounding reference signalin the secondary serving cell performed by the terminal, after theterminal receives a timing advance value of the new timing advancegroup.
 13. An apparatus for uplink interference avoidance in case oftiming advance group reconfiguration, comprising: a timing advance groupreconfiguring unit, configured to reconfigure a timing advance groupbelonging to a secondary serving cell; a judging unit, configured tojudge whether the reconfigured timing advance group is a new one, and ifyes, notifying an executing unit; and the executing unit, configured torelease configuration of a periodic channel sounding reference signal ofthe terminal in the secondary serving cell, and/or flush all buffers ofuplink hybrid automatic retransmission requests to which the secondaryserving cell of the terminal corresponds, according to a notificationtransmitted by the judging unit.
 14. The apparatus according claim 13,wherein the executing unit is further configured to cancel transmissionof an aperiodic channel sounding reference signal in the secondaryserving cell performed by the terminal, according to a notificationtransmitted by the judging unit.